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Simplifying 3r + 3(r + 3) = 315 Reorder the terms: 3r + 3(3 + r) = 315 3r + (3 * 3 + r * 3) = 315 3r + (9 + 3r) = 315 Reorder the terms: 9 + 3r + 3r = 315 Combine like terms: 3r + 3r = 6r 9 + 6r = 315 Solving 9 + 6r = 315 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 6r = 315 + -9 Combine like terms: 9 + -9 = 0 0 + 6r = 315 + -9 6r = 315 + -9 Combine like terms: 315 + -9 = 306 6r = 306 Divide each side by '6'. r = 51 Simplifying r = 51
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